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Sound barrier

  1. Sep 2, 2009 #1
    Call me crazy, but my fiance has been watching a lot of UFO stuff lately. I am extremely skeptical, but it put a question into my head, that I can not seem to find an answer to in my random searches on google.

    Can an object that makes no sound while accelerating create a sonic boom when breaking the sound barrier?

    Whenever I read about the sound barrier I find lots of answers on physics theory, calculations, examples, pictures, etc. All things that I have found refer to aircraft breaking the speed of sound. Well we all know how loud planes are, and I can understand the loud sound when a sound is generated by the aircraft itself.

    But what about, theoretically, a propulsion system that is completely silent? Any help?
  2. jcsd
  3. Sep 2, 2009 #2


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    Welcome to Physics Forums.

    You should note that the creation of a sonic boom has nothing what-so-ever to do with propulsion system of an object. A sonic boom is a result of was is termed a shock. This shock is formed from the pressure waves created by the object simply moving through the air.

    See http://en.wikipedia.org/wiki/Sonic_boom#Causes for more information.
  4. Sep 2, 2009 #3
    Thanks. I guess I just didnt read far enough down on the wiki page. :) Either way I found the Physics Forum in the process!
  5. Sep 2, 2009 #4


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    Welcome aboard! It's good to have you here :smile:
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